Design and analysis of a dual-polarization multiband oval ring patch antenna with L-stubs and folded meander line for C-band/X-band/ Ku-band/ K-band communications

In this paper, a multiband oval ring patch antenna is presented. The proposed antenna consists of a quarter wavelength folded meander line attached inside the ring and a pair of quarter wavelength 'L' shaped stubs are attached outside the ring which helps antenna in radiating at multiple resonant frequencies with proper impedance matching performance. Antenna with the dimensions of 10 x 12 x 1.524 mm(3)has been designed, fabricated and tested. The proposed antenna exhibits -10 dB impedance at the centre frequency of 6.21 GHz(315 MHz), 9.4 GHz(671 MHz), 16.78 GHz(441 MHz), and 25 GHz(3.21 GHz) from the experimental results. It covers a wide variety of wireless applications namely C-band communications (4 GHz-8 GHz), X-band communications (8 GHz-10 GHz), K-u-band communications (16 GHz-17 GHz), and K-band communications (24 GHz-27.3 GHz). The proposed antenna exhibits gains of 1.01 dBi, 1.2 dBi, 5.6dBic and 8.1 dBi along with the efficiencies of 60.14%, 74.3%, 78.6% and 83.64% at 6.21 GHz, 9.42 GHz, 16.78 GHz, and 25.4 GHz respectively. The patch exhibitsRight Hand Circular Polarisation (RHCP)at 16.78 GHz and linear polarisation at remaining resonant frequencies. The measured and simulated results are in good agreement.